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Loans and allowance for credit losses - Analysis of Aging by Class of Financing Receivable (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Financing Receivable, Past Due [Line Items] |  |  |  |
30-89 days past due | $ 26,995 |  | $ 18,477 |
90 days or more and accruing interest | 13,696 |  | 5,543 |
Non-accrual loans | 50,760 |  | 21,062 |
Loans current on payments and accruing interest | 6,991,508 |  | 4,307,408 |
Loans | 7,082,959 | $ 4,409,642 | 4,409,642 | $ 3,667,511
Purchased Credit Impaired loans |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans current on payments and accruing interest |  |  | 57,152 |
Loans |  |  | 57,152 |
Commercial and industrial |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
30-89 days past due | 3,297 |  | 1,918 |
90 days or more and accruing interest | 330 |  | 291 |
Non-accrual loans | 16,005 |  | 5,587 |
Loans current on payments and accruing interest | 1,326,490 |  | 1,024,556 |
Loans | 1,346,122 |  | 1,034,036 | 867,083
Commercial and industrial | Purchased Credit Impaired loans |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans current on payments and accruing interest |  |  | 1,684 |
Loans |  |  | 1,684 |
Construction |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
30-89 days past due | 7,607 |  | 1,021 |
90 days or more and accruing interest | 573 |  | 42 |
Non-accrual loans | 4,053 |  | 1,087 |
Loans current on payments and accruing interest | 1,209,987 |  | 546,067 |
Loans | 1,222,220 |  | 551,101 | 556,051
Construction | Purchased Credit Impaired loans |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans current on payments and accruing interest |  |  | 2,884 |
Loans |  |  | 2,884 |
Residential real estate | 1-to-4 family mortgage |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
30-89 days past due | 7,058 |  | 10,738 |
90 days or more and accruing interest | 10,470 |  | 3,965 |
Non-accrual loans | 5,923 |  | 3,332 |
Loans current on payments and accruing interest | 1,065,819 |  | 673,081 |
Loans | 1,089,270 |  | 710,454 | 555,815
Residential real estate | 1-to-4 family mortgage | Purchased Credit Impaired loans |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans current on payments and accruing interest |  |  | 19,338 |
Loans |  |  | 19,338 |
Residential real estate | Residential line of credit |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
30-89 days past due | 3,551 |  | 658 |
90 days or more and accruing interest | 239 |  | 412 |
Non-accrual loans | 1,757 |  | 416 |
Loans current on payments and accruing interest | 402,664 |  | 219,971 |
Loans | 408,211 |  | 221,530 | 190,480
Residential real estate | Residential line of credit | Purchased Credit Impaired loans |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans current on payments and accruing interest |  |  | 73 |
Loans |  |  | 73 |
Residential real estate | Multi-family mortgage |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
30-89 days past due | 0 |  | 63 |
90 days or more and accruing interest | 57 |  | 0 |
Non-accrual loans | 0 |  | 0 |
Loans current on payments and accruing interest | 175,619 |  | 69,366 |
Loans | 175,676 |  | 69,429 | 75,457
Residential real estate | Multi-family mortgage | Purchased Credit Impaired loans |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans current on payments and accruing interest |  |  | 0 |
Loans |  |  | 0 |
Residential real estate | Non-owner occupied |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 1,598,979 |  |  |
Commercial real estate |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 924,841 |  |  |
Commercial real estate | Owner occupied |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
30-89 days past due | 98 |  | 1,375 |
90 days or more and accruing interest | 0 |  | 0 |
Non-accrual loans | 7,948 |  | 1,793 |
Loans current on payments and accruing interest | 916,795 |  | 621,211 |
Loans | 924,841 |  | 630,270 | 493,524
Commercial real estate | Owner occupied | Purchased Credit Impaired loans |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans current on payments and accruing interest |  |  | 5,891 |
Loans |  |  | 5,891 |
Commercial real estate | Non-owner occupied |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
30-89 days past due | 915 |  | 327 |
90 days or more and accruing interest | 0 |  | 0 |
Non-accrual loans | 12,471 |  | 7,880 |
Loans current on payments and accruing interest | 1,585,593 |  | 902,340 |
Loans | 1,598,979 |  | 920,744 | 700,248
Commercial real estate | Non-owner occupied | Purchased Credit Impaired loans |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans current on payments and accruing interest |  |  | 10,197 |
Loans |  |  | 10,197 |
Consumer and other |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
30-89 days past due | 4,469 |  | 2,377 |
90 days or more and accruing interest | 2,027 |  | 833 |
Non-accrual loans | 2,603 |  | 967 |
Loans current on payments and accruing interest | 308,541 |  | 250,816 |
Loans | $ 317,640 |  | 272,078 | $ 228,853
Consumer and other | Purchased Credit Impaired loans |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans current on payments and accruing interest |  |  | 17,085 |
Loans |  |  | $ 17,085 |

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